Fix a bug where the value 0 wasn't valid when entering

data into the DataForm.

docs/changelog/7.x.x.txt

@@ -17,6 +17,7 @@
  - fixed: PurgeOldInboxMessages just didn't work
  - fixed: Unable to delete data form entries
  - fixed: Select All checkbox in Asset Manager has returned
+ - fixed: DataForm Integer value zero does not pass validation
  - added: Page range (start-finish) to available paginator text
 
 7.5.22

lib/WebGUI/Asset/Wobject/DataForm.pm

@@ -1371,7 +1371,7 @@ sub www_process {
             });
             WebGUI::Macro::filter(\$value);
         }
-        if ($field->{status} eq "required" && (!$value || $value =~ /^\s*$/)) {
+        if ($field->{status} eq "required" && (! defined($value) || $value =~ /^\s*$/)) {
             push @errors, {
                 "error.message" => $field->{label} . " " . $i18n->get(29) . ".",
             };